Ink



No Drawing.

Patented Dec. 26, 1922.

UNITED STATES PAT NT. OFFICE. 1

HOWARD WATERS DOUGHTY, or AMHERST, mnssncnusn'r'rs, issrenon 'ro ancnmuc GOLD COMPANY, me, a CORPORATION or NEW YORK.

INK.

To all whom, it may concern:

Be it known that I, HOWARD WATERS DOUGHTY, a citizen of' the United States, residin at Amherst, in the county of Hampshire, tate of Massachusetts, have invented for other purposesto which the ink may be adapted.

In stamping titles in gold, for example, on books, labels and like materials, it has been the practice heretofore to employ old or imitation gold leaf. Thexleaf is app 'ed manually after the surfaceof the material has been treated with size, and the sur lus isfactory work therewith.

will dry rapidly.

leaf must be removed after stamping. everal operations are thus involved and the application of leaf in the manner described is consequently expensive. The use of artificial leaf eflfects a saving only in the cost of the leaf. Artificial leaf is, moreover, unsatisfactory because of the inferior quality of the work which quickly tarnishes when.

exp osed'to the efi'ect of'the atmosphere.

he use ,of metallic pigment inks has been suggested heretofore as a substitute for metallic leaf in stamping operations. No suitable inks have been available, however, and .it has been impossible to produce set- A difliculty which has revented the use of metallic pigment inks s due to vehicles which dry too rapidly on the inking rolls, covering them generally with a gummy coating whlch prevents transfer of the ink to the type or die.

In avoiding this extreme it necessary to once applied provide an ink which when It is the 'ObJBCi', of the invention, therefore,

to provide an ink and an ink vehicle having the necessary properties, among others comparative slowness in drying without a tendenc to. become gummy a consistenc permitting transference of theink throng Application filed-May 8, 1922, "Serial No. 559,419.

inking rolls to the type or die, rapid drying when applied to the work, and ability to protect the pigmentfrom'oxidation and consequent discoloration. 1

I have discovered that these desirable properties may be imparted to-.the ink by the use of-a suitable medium in the vehicle for the pigment and that such a medium will, moreover, permit rapid drying of the ink by the application of heat to the type or die. The medium should be volatile, i. ej., Y

capable of being vaporized without carboni zation, but its boiling point should be-relatively high to reduce vaporization at atmos pherlc temperatures, and consequently to prevent rapid drying on the inking rolls. The medium must, moreover, be a solvent for the body of the vehicle. Preferably the boiling point of the selected medium should be between 200 and 300 (1-; a boiling point lower th'an 250 0. being desirable' Solvents-boiling materiallv below 200 C. are

unsuitable because the ink dries too rapidly,

on the rolls and becomes gummy. Solvents boiling materially above 300 C. are likewise unsuitable because the ink cannot be successfullydried except by the application of impracticably high temperatures. A suitable medium may be found in the derivaties of the terpene series of hydrocarbon com pounds," the alcohols, of which terpineol is an example, being admirably adapted for the purpose Terpineol is capable of imparting the desired properties to the vehicle in a marked degree, and is at the same time.

readilyavailable in commerce and relatively inexpensive. Other suitable solvents are benz'yl alcohol and .certain esters of aromatic acidssuchas terpinyl acetate, benzyl acetate and ethyl benzoate. Oil of, dammar resin is also a suitable solvent,this and the other solvents-mentioned having the distinguishing characteristics above referred to.

In carrying out the invention the solvent is combined-with a thickening agent forming the body of the vehicle. Preferably a resinous material such as colophony (ordinary rosin) dammar, copal, Burgundy pitch or Canada balsam, is dissolved in the solvent to produce a-vehicle of the desired consistency.

Aproportion of benzoin may be'added'with -'advantageto 'thecomposition, replacing v the rolls.

i i The alloy is reduced to a state of fine sub-' portion of the other resinousmaterial, or benzoin may be substituted for either of the resins mentioned, which, of course, may be mixed or combined in any desired proportions, although for commercial reasons it is preferred to employ colophony alone as a resinous ingredient ofthe composition. The pigment, preferably a bronze or other metal lic powder of the desired color, is thoroughly incorporated with the vehicle to complete the ink.

It is to be understood that equivalents of the terpineol, benzyl alcohol or other solvent may be substituted therefor and that materials naturally containing these solvents may be employed. Artificial mixtures containing the solvents mentioned may be used also. 'Natural or artificial mixtures of the solvent should have a minimum boiling point of substantially 200 C. to avoid too rapid drying of the ink upon The bronze or other metallic'powder used may be the ordinary article ofcommerce.

and may consist, for example, of an alloy of copper with other metal or metals adapted to impart the desired color to the alloy.

division in the usual manner. Metallic powders containing metals other than copper can be used.

As an example of the application of the invention, the vehicle may comprise four parts of the solvent, benzyl alcohol for example, to one'part of ordinary rosin. Preferably the benzyl alcohol is heated to a temperature ranging from 100 -to 130 C. and is maintained at that temperature while the rosin is dissolved therein. The proportions of resin and solvent may be varied within the limits necessary to produce a vehicle of the proper viscosity. The vehicle and metallic powder are thoroughly mixed preferably in the proportions of two parts of the powder to one part of the vehicle.

The ink produced as described may be applied by means of the usual ink fountain or table to the inking rollers and thence transferred to the type or die.- Dryingof the'- ink on the rollers, a fault which has characterized inks heretofore suggested, is avoided. The ink'dries very slowly at atmospheric temperature owing to the high boiling point of the volatile solvent. It dries rapidly, however, .when applied with a heated die. The impression is highly glossed and the vehicle forms a lacquer which protects the pigment from tarnishing, thus providing a permanent and highly satisfactory title or decoration on bookbindings, and the like. The color will depend upon the particular pigment employed which may be other than'metallic in charac er.

The ink described, though particularly therein, 11. An ink having a metallic pigment and suitable for book-binders use, will serve point of which is not materially lower than 2. An ink having a metallic pigment and a vehicle comprising a resinous substance and a volatile solvent therefor with a boiling point between 200 and 300 C.

p 3. An ink having a metallic pigment and a vehicle comprising a resinous substance and a volatile solvent therefor with a boiling point between 200 and 250 C.

4. An ink having a metallic pigment and a vehicle comprising ordinary rosin and a volatile solvent therefor, the boiling point of which is not materially lower than 200 C.

5.An ink having a metallic pigment and a vehicle comprising ordinary rosin and a volatile solvent therefor with a boiling point between 200 and 300 C.

6. An ink having a metallic pigment and a vehicle comprising ordinary rosin and a volatile solvent therefor with a boiling point between 200 and 250 C.

7. An ink having a metallic pigment and a vehicle comprising a resinous substance and benzyl alcohol as a solvent therefor.

83 An ink having a metallic pigment and a vehicle comprising a resinous substance and a solvent therefor containing benzyl alcohol. v

9. An ink having a metallic pigment and a vehicle comprising a Solvent containing benzyl alcohol'and a thickening agent dissolved therein.

10. An ink-having a metallic pigment and a vehicle comprising asolvent, the boiling point of which is not materially lower than 200 C. and a thickening agent dissolved a vehicle comprising a solvent with a boiling point between 200 and 300 C. and a thickening agent .dissolved therein.

12. An ink having a metallic pigment and s a vehicle comprising a solvent with a boiling point between200 and 250 C. and a thickening agent dissolved therein.

13. In an ink a vehicle comprising a resinous substance and a volatile solvent therefor, the boiling point of which is no materially lower than 200 C. V

14:. In an ink a vehicle comprising a resinous substance and a volatile solvent 4 therefor with a boiling point between 200 and 300 C.

15. In an ink a vehicle comp-rising a resinous substance and a volatile solvent therefor with a boiling point between 200.

and 250 C; 16. In an ink a. vehicle comprising ordinary rosin and a volatile solvent therefor, the boiling point of which is not materially lower than 200 C.

17. In an ink a vehicle comprising a resinous substance and benzyl alcohol as a solvent therefor. a

18. In an ink a vehicle comprising a resinous substance and a solvent therefor 1 containing benzyl alcohol.

19. In an ink a While comprising a solvent containing benzyl alcohol and a thickening agent dissolved therein.-

20. In an ink a vehicle comprising a solvent containing benzyl alcohol and ordinary rosin dissolved therein.

21. In an ink a vehicle comprising ordinary'rosin and benzyl alcohol as a solvent therefor.

22. In an ink a vehicle comprising asolvent, the boiling point of which is not materially lower than 200 C. and a thickening agent dissolved thereini.

23. In an ink a vehicle comprising a solvent with a boiling point between 200 and 300 C. and a thickening agent dissolved therein.

24. In an ink ,a vehicle comprising a solvent-with a'boiling point between 200 and 250 C. and a thickening agent dissolved therein.

In testimony whereof I aflix my signature. HOWARD WATERS DOUGHTY. 

